Attachment for lamp-chimneys.



NO- 638,302. Patented Dec. 5, I899.

R. w. WALMSLEY. ATTACHMENT FOR LAMP GHIMNEYS.

(Application flied Feb. 18, 1899.)

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removed, parts being shown in section.

ITE TAT ATTACHMENT FOR LAM P-CHIMNEYS.

SIEGIFICATION forming part of Letters Patent No. 638,302 dated December 5, 1.899.

Application filed February 18, 1899. Serial No. 706,058. (No model.) i

To ctZZ whom, it may concern:

Be it known that 1, ROBERT W.WALMsLEY, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, haveinvented certain new and useful Improvements in Gas-Burners; and I do hereby declare the following to-be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in devices for economizing heat and is intended, primarily, to be applied as an attachment to the chimneys of incandescent burners. It may also, however, be applied to other forms of lamps.

The object of my invention is to economize heat and fuel by checking and regulating the draft; and with this end in view my invention consists in the constructions and combinations of parts, as hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 represents in side elevation an incandescent burner with my invention applied thereto.

Fig. 2 is a longitudinal central section of my invention, also showing a part of the lampchimney. Fig. 8 is a top view with the cover Fig. 4 is a detail view showing the construction of the hinge. Fig. 5 is a perspective view of one of the adjustable rests. Fig. 6 is a perspective view, enlarged, of the clip through which passes the screw for secnrin g the hinge of the cover upon the collar; and Fig. 7 is a fragmentary view showing a modified form of the hinge. t

As shown in Fig. 1, my device may be suitably secured to the top of a lamp-chimney O by means of a collar It, provided with an inwardly-projecting shoulder r.

Firmly connected by a hinge B to the collar R is an inverted concave lid L, provided with a downwardly-proj ectin g shoulder Z. In its operative position, as shown in full line in and hinge are made adj ustable, so that the size of the aperture J may be varied as desired. For this purpose each of the rests E is provided with a slot e, through which passes a screw 6, which engages the screw-threaded hole or holes in the collar R, or preferablyin an upright E applied thereto. The lower leaf 1) of the hinge B is provided with a slot 19'. A clip 11 surrounds the lower leaf of the hinge, and a screw 5 provided with a Washer 17 projects through the clip 6 and the slot 1) and engages with the collar R or with a supporting-piece 19 provided with holes for the reception of the screw 19 which piece b is attached to the collar R, as seen in Figs. 2 and 7. The clip has side flanges which abut against the side edges of thelower leaf 2) of the hinge, as well as against the side edges of the supporting-strip b fixed to the collar R, and serves to guide and hold the hinge in an upright position.

To the under side of the lid L is attached, by means of a screwm, the bolt m, the lower end of which, M, is screw-threaded. A not M holds the inverted concave plate G on this bolt. The plate Gis smaller in diameter than the throat of the chimney O, leaving a clear space S between the edge of the plate and the inner surface of the chimney.

A handle 0 is attached to the lid L and is used to raise the lid and plate G into the p0 sition shown in dotted lines in Fig. 1 and toy return it to the position shown in Fig. 2. This allows free access to the mouth of the chimney and facilitates the ignition of the mixed air and gas and the primary heating of the mantle after combustion has started.

l/Vhen the mantle has become thoroughly heated, the lid L and plate G are lowered into the position shown in Fig. 2, thus partially closing the throat of the chimney and allowing only so much of the gases to escape as can pass through the aperture J, which is much smaller in area than the throat of the chimney. As a result the velocity of the ascending gases is diminished and more time is allowed for the completion of the combustion within the chimney. This effect is uninterruptedly produced as long as combustion is maintained and the device remains in position. By thus retarding the escape of the heated gases the burning gases are more ini2 sa ba timately and for a longer time kept in contact with the substance to be heated, combustion is more complete, greater eflicieney of fuel is attained, and consequently less gas is required to obtain a certain amount of heat and light.

In Fig. 7 is shown a modification B of the hinge. This hinge B is the ordinary stophinge, and the extensions 13 prevent the lid L from falling too far. In other Words, they hold the lid L parallel with the collar It, thus doing aWay with the necessity of the rests E.

collar and retained by said clamping-screwi and means for supporting said plate in a horizontal position, substantially as described.

2. In an attachment for chimneys, the combination with a flanged collar fitting and resting upon the top of the chimney; a clip upon said collar and a clamping-screw mounted in said clip; of a circular plate surmounting said collar; an inverted concave disk carried beneath said plate; a hinge having one leaf rigidly fixed to said circular plate and having its other leaf engaging in the clip on said collar and retained by said clamping-screw; and vertically-adjustable stops for maintaining the said plate in a plane parallel to the plane of the said collar, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

ROBERT W. WrtLMSLEY. Witnesses:

ANDREAS S'CHL'OSSER, J. P. BALDWIN. 

